Burnishing tool



A. CALLEBERT.

BURNISHING TOOL. Y APPLICAIION FILED MAY 5. 192|.

Patented Sept. I9, T922.

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ALroNsE CALLEBERT, or JACKSON, IvrIcHIeAN, AssIeNor. To anx iiIACI'IIIvIal T091.

COMPANY, or JaCKsoN, MICHIGAN, ,a .con-rozaa'rroN or MICHIGAN.

BURNISHING TOOL.

Application mea may 5, 1921. serial-N. 467,075.Y

To all w 710m t may Connem- Be .it known that I, A LnoNsn CALLEBERT, a subject ot the King of Belgium. residing at Jackson, in the county o' Jackson and State of Michigan, have invented certain new and useful Improvements in Burnishing Tools, of which the tollowing'is a speci.- ication. y Y f This invention relates to ternal combustion engine cylinders.

It is the object of the present invention to provide an improved tool-of this type.

In the drawings,- v y Fig. l is a longitudinal section of the tool.

Fig. 2 is an elevation of the tapered spreading pin.

Fig. 3 is a plan view of one ot the burnishing rolls.

Fig. a is a section on the line 4r-4 of Fig. 1. Y

The tool is made up of a cylinder a and a barrel b that screw together at c to I'orm what amounts to practically an invisible joint. The barrel or body member Z) has a hollow interior with two large slots Z cut in the side to permit the operator-s fingers to have access to the knurled adjusting nut e. This adjusting nut is provided with a hub f whichvengages around the studlike end f/ of the tang` h'. The nut is also provided with a hub z' that engages around the boss j projecting inwardly from the outer cylinder a.

The tang h has a shoulder 7c and is provided with external threads between this shoulder and the stud-like end of the tang. This permits the tang to be screwed in the end of the barrel b and when so screwed in place the nut c becomes rotatably supported on the two bearing members g and The cylinder a has a hollow interior of smaller diameter than the interior of the barrel. This acts as a guide for the tapered pin 7c which has a key-way Z cut in one side which engages with the endrof the set screw key fm. This prevents the tapered pin from turning. v Obviously when the nut e is turned upon its bearings, the threaded stem Va of the tapered pin engaging the threads of the nut, this tapered pin is caused to travel longitudinally within t-he body of the tool. This causesl the rolls 0 that are rotatably supported on the pins Q on the burnishing tools, especially tools Intended 'torburnishin'g in` sliding `carriages, p to spread as the .tap-` ered vpin moves outwardly. This spreading action is caused byreasonkof the back of the carriages being chamfered as at 1'. The conical end of the tapered pin 'engages' against these chamfcred carriage backs and forces the carriages outwardly. Into the ends of these carriages are ldriven the pins s which engage inthe ,counterbore seat .t of the cap plate u. This counterbore Wall acts as a stop in connection with the pins s to prevent the rollsdropping out of the i slots u in which they travel. vThere are four of these rolls and carriages. f

The tool may be inserted 4in the work .With the cylinder projected into the work. The knurled n ut e may then be turned to proj ect:

, the ,burnishifng rolls outwardly; and a tool` may be 4inserted inthe openings x in the knurled nut `to force the burnishing rolls tightly against thewmk."` .The .carriag-is` accurately-within,"theirguide vslots lv' andk have yoke-like arms to give support to the rolls atboth ends.

When the cap plate u has been taken o by loosening the screwsg/ that screw into the post-like portions of the cylinder a, the burnishing rollsand carriages are free to drop out ot' their slots. The tapered pin may be taken out by turning thenut until it letsgo of the threads of the tapered pin threaded stem n. The nut e can only be disassembled when the cylinder and barrel that form the body are screwed apart, which will seldom be necessary, if ever. Y

From the above description it will bepseen that a simple assembly of a few parts serves to lock the operating or moving parts of the tool in their relative position. The cap plate lwand the cylinder a constitute what, in the claims, I term the body.

llVhat I claim is:

l. In a tooltor the purpose specified, theV combination of a hollow body member, a reciprocating spreader guided longitudi- 1 nally therein and provided with a threaded stem projecting out of one end of the body Y member, a projecting boss or bearing encircling said threaded'stem and projecting from the end of the body member, a barrel having a hollow interior provided with a projecting stud or bearing, the said bar rel provided with slots in its side andhaving the body member, and a nut rotatably' vmeans for detachably'engaging the end orV locked in place upon'the said boss and the said stud and in engagement with the threads of the spreader stem, when the barrel is engaged with the body member.

2. In a tool for the purpose specified, the combination of a bodymember provided with a projecting boss, a tapered pin guided longitudinally therein and provided with a threaded stem that projects through said boss, a barrel provided with slotted sides and detachably engaging with the inner end of the body member, and a Vtang screwing into the barrel and provided with a projecting end portion or bearing, and an adjusting nut having hub portions adapted to rotatably engage the boss and the projecting end portion of the tang when the barrel and body member are locked together and adapted to screw onto the threads of the tapered pin spreader.

3. In a tool for the purpose specified, the combination of a hollow body member, a tapered pin guided longitudinally therein, means for forcing the tapered pin longitudinally, the said body provided with slots at the side, a plurality of carriages radially slidabler in said slots and forced radially by the said pin, a cap plate removably engaging the end of the body member and provided with means engaging portions of the carriage to act as stops for the carriages inV their outward movement. and burnishing rolls carried by the said carriages.

4. In a tool for the purpose specilied, the combination of a hollow body member, a tapered pin guided longitudinally therein, means 'for forcing the tapered pin longitudinally ot' the body member, said body member provided with radially-directed slots, carriages slidable in said slots and spread by the said pin, burnishing rolls supported upon the said carriages each of said carriages being provided with a pin, and a plate removably secured to the end oi the body member and having a counterbore on its inside in which the projecting pins oi the carriages engage to prevent the carriages from dropping out ci their slots.

5. In a tool for the purpose specified, the combination of a body, carriages slidable radially therein, burnishing rolls rotatably supported by said carriages, a tapered pin for engaging said carriages to torce the same outwardly, the pin having a threaded slianlr at one end, a slotted barrel screwing into the end of the body, a nut trapped in the barrel between the end of the barrel and the .end of the body and engaging the threaded shank of the pin, and means for preventing the tapered pin turning.

ln testimony whereof aix my signature.

ALFONSE CALLEBERT. 

